Financing Receivables and Operating Leases (Schedule Of Financing Receivables Categorized By Internal Credit Risk Rating) (Details) (USD $) In Millions, unless otherwise specified	Jul. 26, 2014		Jul. 27, 2013		Jul. 28, 2012
Financing Receivable, Recorded Investment [Line Items]
FInancing receivables (including residual value, if any) net of deferred income	$ 8,187		$ 8,041
Total financing receivables before allowance for credit loss	8,420	[1]	8,292	[1]	7,626	[1]
1 to 4
Financing Receivable, Recorded Investment [Line Items]
FInancing receivables (including residual value, if any) net of deferred income	4,312		4,399
5 to 6
Financing Receivable, Recorded Investment [Line Items]
FInancing receivables (including residual value, if any) net of deferred income	3,498		3,400
7 and Higher
Financing Receivable, Recorded Investment [Line Items]
FInancing receivables (including residual value, if any) net of deferred income	377		242
Total
Financing Receivable, Recorded Investment [Line Items]
FInancing receivables (including residual value, if any) net of deferred income	8,187		8,041
Lease Receivables
Financing Receivable, Recorded Investment [Line Items]
FInancing receivables (including residual value, if any) net of deferred income	3,294		3,256
Total financing receivables before allowance for credit loss	3,527	[1]	3,507	[1]	3,179	[1]
Lease Receivables | 1 to 4
Financing Receivable, Recorded Investment [Line Items]
FInancing receivables (including residual value, if any) net of deferred income	1,615		1,681
Lease Receivables | 5 to 6
Financing Receivable, Recorded Investment [Line Items]
FInancing receivables (including residual value, if any) net of deferred income	1,538		1,482
Lease Receivables | 7 and Higher
Financing Receivable, Recorded Investment [Line Items]
FInancing receivables (including residual value, if any) net of deferred income	141		93
Lease Receivables | Total
Financing Receivable, Recorded Investment [Line Items]
FInancing receivables (including residual value, if any) net of deferred income	3,294		3,256
Loan Receivables
Financing Receivable, Recorded Investment [Line Items]
FInancing receivables (including residual value, if any) net of deferred income	1,683		1,649
Total financing receivables before allowance for credit loss	1,683	[1]	1,649	[1]	1,796	[1]
Loan Receivables | 1 to 4
Financing Receivable, Recorded Investment [Line Items]
FInancing receivables (including residual value, if any) net of deferred income	953		842
Loan Receivables | 5 to 6
Financing Receivable, Recorded Investment [Line Items]
FInancing receivables (including residual value, if any) net of deferred income	593		777
Loan Receivables | 7 and Higher
Financing Receivable, Recorded Investment [Line Items]
FInancing receivables (including residual value, if any) net of deferred income	137		30
Loan Receivables | Total
Financing Receivable, Recorded Investment [Line Items]
FInancing receivables (including residual value, if any) net of deferred income	1,683		1,649
Financed Service Contracts and Other
Financing Receivable, Recorded Investment [Line Items]
FInancing receivables (including residual value, if any) net of deferred income	3,210		3,136
Total financing receivables before allowance for credit loss	3,210	[1]	3,136	[1]	2,651	[1]
Financed Service Contracts and Other | 1 to 4
Financing Receivable, Recorded Investment [Line Items]
FInancing receivables (including residual value, if any) net of deferred income	1,744		1,876
Financed Service Contracts and Other | 5 to 6
Financing Receivable, Recorded Investment [Line Items]
FInancing receivables (including residual value, if any) net of deferred income	1,367		1,141
Financed Service Contracts and Other | 7 and Higher
Financing Receivable, Recorded Investment [Line Items]
FInancing receivables (including residual value, if any) net of deferred income	99		119
Financed Service Contracts and Other | Total
Financing Receivable, Recorded Investment [Line Items]
FInancing receivables (including residual value, if any) net of deferred income	$ 3,210		$ 3,136

[1] Total financing receivables before allowance for credit loss.